TweetFollow Us on Twitter

Feb 90 Mousehole
Volume Number:6
Issue Number:2
Column Tag:Mousehole Report

SE/II Emulator

By Larry Nedry, Contributing Editor

From: Skaros

Re: Emulate an SE or a II?

Well, now that the 68030 seems to be becoming the standard cpu for the Mac what happens to all the software written for the other machines(Plus,SE,II) that won’t run on a 68030 machine. Well, if you paid buck$ then chances are your software is being upgraded and you can always buy the next version that is MacIIx compatible etc. But, isn’t there someone out there who knows how to write an emulator that would run on a CX and let you use all your favorite software that so far only works on a II or SE, for example, Dark Castle, Arkanoid, or Continuum. If SoftPC can write an app that lets you have an IBM XT equivalent in a window, what do I have to do to write something that lets me use my old programs. What do I have to patch to make it work. After all, the 68030 is a 16 MHz machine; an 8 MHz emulator should be a cinch. Although I’ve written a few small apps for myself, I don’t know enough about the Mac to do this. I’ve a hunch it’s even underneath knowing the toolbox--busses,wait states, and a whole lot of other stuff that I have little experience with. Can anyone shed a little light on the matter?

From: Frankh

Re: Emulate an SE or a II?

A probable source of incompatibility is the screen. Many old Mac games wrote directly to the screen, bypassing the Toolbox. Other headache sources may be software timing loops, and code that depends on certain hardware features of the older machines. I guess that with some work, you could set aside some ram to simulate the screen buffer and then send it to a video card, or intercept all calls to what used to be the screen buffer address. You could make all these patches, and sho’nuff, you’ll end up with a fast B&W Mac 512 (or 128K!) clone running on a CX.

Or...you can call up the companies in question and ask them when they’re coming out with a version that works on the newer machines.

From: Skaros

Re: Emulate an SE or a II?

You’re probably right because when I make the SE30 the main screen the game, oids, doesn’t run, but when the Rasterops driven Apple monitor is the main screen it runs in a half baked way - only using the upper half of the screen for the game. I can only get oids to do this when I’ve booted from sys4.2 When I’ve booted from 6.03, the game is “smart” enough to tell me it can only run on a II or an SE. I wonder what screen specific changes exist between the two Systems?

From: Apage

Re: Emulate an SE or a II

Some applications use self modifying code in order to boost performance. When the II first came out with the 68020 it causes problems with the instruction cache. When the code was modified the modified instruction was already in the cache and so the modification that was expected to take place wasn’t there and thus many programs bombed. The 68030 also has a data cache, so the problems with self modifying programs now reach deeper. There is an assembly language instruction (MOVECR (move to control register)) in the 020/030 instruction set. Use this to turn off the caches and see if that gets your programs running.

From: Skaros

Re: Emulate an SE or a II

Well I tried turning off the cache with a great Init called cache control by J.Hamilton. It doesn’t work. BUT, I got it to work using system 4.2!! But when I run the program it only uses half a screen at a time and then runs using the upper half of the screen. Interestingly this is a 256 color game named oids and I’m using a rasterops card with an Apple color monitor hooked to an SE30. The program doesn’t run when I make the Mac the main screen. Probably has to do with the way the game addresses the screen buffer. But, why should it be smart enough to say it can’t run when I’ve booted with sys6.03 but it goes ahead and runs crazy when I’ve booted with sys 4.2?

From: Frankh

Re: CRC code

I’m looking for a fast CRC generator (in Pascal, preferably). I translated some C code, but it was not all that fast...Any code (C or assembly would be OK too) would be appreciated.

From: Larry Nedry

Re: CRC code

Don’t use a CRC generator. Use a lookup table. MUCH FASTER!

There is a very good book on serial communications called “C Programmers Guide to Serial Communications” by Joe Cambell. It has everything you’ve every wanted to know about CRC’s.

From: Infosyn

Re: OOP, Think Pascal

Is there anyone else out there writing OOP stuff with Think Pascal? Have you also run into the problem of a method not being in memory when you call it? Symantec says the manual warns that it’s up to the programmer to make sure the requisite segment has been loaded, so I’ve been loading ‘em all at launch time. But with 300K of CODE in 36 units in 12 segments, it hurts! Anybody figured out a better way?

From: Chenette

Re: OOP, Think Pascal

I’ve had trouble with dangling or missing handles causing the method not found error. Are you trying to dereference any nil handles?

From: Infosyn

Re: OOP, Think Pascal

I wish it were that easy. Unfortunately this is a serious design flaw in Think Pascal. Normally all globally referenced routines have addresses in the application’s jump table, so the Segment Manager “automatically” ensures that the respective segment is in memory before you call it. But with a method, there’s no such guarantee. And LSP does not have any internal way to keep track of which segment each method is in, so it’s currently entirely up to the programmer to make sure that the correct segments are in memory. (At least that’s the way Symantec describes it.)

But there are evidently other factors at work here, and I was hoping someone had discovered an easy work-around. For example, “sometimes” you can avoid the address error crash by moving the *declaration (not the definition) of the method to a different segment. This part is unclear to me (as you can tell.) Symantec is fully aware of the situation and is almost willing to say they are working on it, I guess. I was hoping someone else knew the straight scoop on this.

From: Siegel

Re: OOP, Think Pascal

The important thing to remember is that the object declaration must be in a segment which is loaded and which stays loaded. The best segment for this purpose is the main segment.

It’s OK to have object declarations in one file and method bodies in another; in fact, it’s much more flexible that way.

From: Siegel

Re: OOP, Think Pascal

By way of clearing up some confusion, let me explain:

The problem you describe is more a drawback of the object pascal architecture than it is a bug in THINK Pascal. In every program, ALL globally referenced routines do have entries in the jump table, but methods are a special case; they’re referenced by means of a class info proc, which is generated when a class of object is declared. In this sense, they’re not globally referenced, which explains why (for example) you can’t take the address of a method as a callback for a Toolbox routine.

The Class Info Proc needs to be in a segment which is initially loaded, and which stays in one place while those methods are used. The best way to ensure this is to have the class declarations in a file which is kept in the main segment, and have the class’s method bodies in another unit which can be placed in any segment; there’s no need for the method bodies themselves to be loaded, only the class declaration.

It is up to the programmer to ensure that the class declaration’s segment is in memory, and the simplest way to do so is to place the class declarations in the main segment, which is never unloaded and which is loaded at launch time.

Rich Siegel, Symantec.

From: Walrus

Re: REAL PROGRAMMERS materialFrom: Fling

Re: Getting APPL’s WDID

Does anybody know a fast, simple method of obtaining the application’s working directory ID. I need to open a companion help file, which should be located in the same directory as the launched application.

From: Mrteague

Re: Getting APPL’s WDID

It’s quite simple - do a GetVol call when you start the application - it will return you the volume name, and the volume refNum, which will be a WDRefNum when you are in a directory (which is set before the Launch trap when launching the application).

From: Siegel

Re: Getting APPL’s WDID

The cheapest way to do this is to open your associated file using a value of 0 as the “vRefNum”, since that specifies the default. The PMSP will then look in the same folder as the application, and if that fails, it’ll look in the system folder.

From: Mrteague

Re: Getting APPL’s WDID

I would add one warning to that method - if you do anything that changes the default directory (like maybe after a SFGetFile/SFPutFile call), then a vRefNum of 0 will give you the *current* default directory, which may *NOT* be the same one that the application originally started with, in case the distinction is important (like Config files etc).

From: Zweig

Re: Think C 4.0 DA Class

Does anyone know where I can find a desk accessory class for Think C 4.0. It looks like they want to support it since there’s an OOPS.A4 library, but I don’t see any clean way to override the menu bartender class or the swictchboard class to handle the DA events. If anyone knows someone who’s done it, please let me know. Thanks.

From: Siegel

Re: Think C 4.0 DA Class

The TCL was not intended for writing DA’s; Code Resources, drivers, and DA’s can be written using Object C, but you’ll pretty much have to roll your own classes.

From: Jumpcut

Re: TCL & List manager?

On the slim chance that somebody may have done my work for me, I was wondering if anyone has a class for a list window under TCL, i.e. a subclass of CDirector and/or CWindow that handles one-column lists. I don’t want to use CDocument, as there is no file connected with this list in any normal manner. Has anybody done this, and would like my eternal thanks and gratitude or do I have to dig in and learn this stuff? Does anyone, in fact, use the Think Class Library other than me? Are there organizations to help us rehabilitate?

From: Apage

Re: TCL & List manager?

I’m working on a subclass of CPane that might be able to help. It would enable you not only to specify objects in the list, and have them returned as objects upon selections, but by use of a superclass I’m defining with it you can alter the behavior of each list item by overriding some default methods. For instance, in the case of a directory in a list of files it would open as soon as you selected it, or appear in a different color to separate it from file entries. However, be advised that I am not looking to give this code away free.

From: Jumpcut

Re: TCL & List manager?

Thanks, but I got my CListPane working. Or nearly working. It creates a list, but it has problems resizing it (it only resizes properly about half the time). I just buckled down and really learned the darn class library. Now it feels great knowing how the thing works, but what really stinks is that I have dreams about it. THAT’s scary. What so you tell your friends? “All my dreams lately have been object-oriented.” They just think I’ve been cloistered with my Mac for too long now...

Another TCL thing: the printing methods work, but only when I set the partition to about 800K. Otherwise I get a “Mac OS error ID -108” which is out of memory. Any ideas? I would like this app to run on any Mac.

From: Jumpcut

Re: PICT resources in dialogs

I use pretty PICTs in my dialog boxes with no problems. I can’t remember if I had to send to the front or back, but I know that they are the highest number in the DITL (whether that’s front or back, I can’t remember.) All of the other items, buttons, editText, etc. are lower numbers. And it works fine for me.

Try making the PICT the highest number. Related note: Adobe Typeface Manager will intercept the drawing of your PICTs if they’re not just bitmaps, like if you created them in MacDraw, so it can really screw up whatever meticulous arrangement you may have spent hours working on in ResEdit. Some days it doesn’t pay to be a perfectionist.

From: Wesm

Re: Compiling MacApp & Error 405

I’m having a hard time with the Pascal compiler with MPW. I just purchased MacApp, and haven’t been able to successfully compile any of the sample programs. Invariably, the compiler aborts with error 405, “Error opening include file”. The file it chokes on is typically {PInterfaces}Types.p or Quickdraw.p. The shell variables seem to be set up correctly. Does anyone out there in MacAppLand know what’s going wrong?

From: Maniac

Re: Compiling MacApp & Error 405

I had a problem w/ MacApp that I solved by increasing the memory for MPW to 2meg. I made a copy of MPW first in another folder w/ the ‘essential’ files and then increased its size. That way, I can run the default or the big memory version as needed. --Mark

From: Dhands

Re: MacApp and Commands

I can’t subclass any of the commands defined in the file UMacApp.TApplication.p (i.e. TNewDocCommand). I get a compile time error that TNewDocCommand is undefined. The unit USES UMacApp and has no trouble finding other standard MacApp commands. How can I include in my unit the commands defined in UMacApp.TApplication.p?

From: Rastamon

Re: MacApp and Commands

The reason you can’t OVERRIDE commands such as TNewDocCommand, is that those objects are defined in the IMPLEMENTATION section of the code (ie.UMacApp.TApplication.p), rather than in the INTERFACE section (ie. UMacapp.p).

You really don’t need to OVERRIDE these commands, though. What you should *really* do is OVERRIDE the method(s) that gets called by the DoIt method of the command you are interested in. In the case of TNewDocCommand, you can just OVERRIDE TApplication.OpenNew.

From: Spud

Re: BigCursor?

Remember the BigCursor program -- the one that doubled the size of the cursor? Well, it doesn’t seem to work on the Mac II. Does anybody out there in ModemLand know why it wouldn’t work on newer machines (remember, it was released in 1984), and maybe offer a suggestion as to how I could update the program to work with new CPU’s and/or color cursors?

From: Spud

Re: BigCursor?

It doesn’t matter. It bombs in color and B&W. You might say it does not discriminate on the basis of color... Y’know, I even asked Apple’s Developer Tech Sport department, and even THEY didn’t know how to enlarge the cursor! It can’t be THAT hard of a hack, can it???

 
AAPL
$102.50
Apple Inc.
+0.25
MSFT
$45.43
Microsoft Corpora
+0.55
GOOG
$571.60
Google Inc.
+2.40

MacTech Search:
Community Search:

Software Updates via MacUpdate

Path Finder 6.5.5 - Powerful, award-winn...
Path Finder is a file browser that combines the familiar Finder interface with the powerful utilities and innovative features. Just a small selection of the Path Finder 6 feature set: Dual pane... Read more
QuarkXPress 10.2.1 - Desktop publishing...
With QuarkXPress, you can communicate in all the ways you need to -- and always look professional -- in print and digital media, all in a single tool. Features include: Easy to Use -- QuarkXPress is... Read more
Skype 6.19.0.450 - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
VueScan 9.4.41 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Cloud 3.0.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more
LibreOffice 4.3.1.2 - Free Open Source o...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
SlingPlayer Plugin 3.3.20.505 - Browser...
SlingPlayer is the screen interface software that works hand-in-hand with the hardware inside the Slingbox to make your TV viewing experience just like that at home. It features an array of... Read more
Get Lyrical 3.8 - Auto-magically adds ly...
Get Lyrical auto-magically add lyrics to songs in iTunes. You can choose either a selection of tracks, or the current track. Or turn on "Active Tagging" to get lyrics for songs as you play them.... Read more
Viber 4.2.2 - Send messages and make cal...
Viber lets you send free messages and make free calls to other Viber users, on any device and network, in any country! Viber syncs your contacts, messages and call history with your mobile device,... Read more
Cocktail 7.6 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more

Latest Forum Discussions

See All

Rhonna Designs Magic (Photography)
Rhonna Designs Magic 1.0 Device: iOS Universal Category: Photography Price: $1.99, Version: 1.0 (iTunes) Description: Want to sprinkle *magic* on your photos? With RD Magic, you can add colors, filters, light leaks, bokeh, edges,... | Read more »
This Week at 148Apps: August 25-29, 2014
Shiny Happy App Reviews   | Read more »
Qube Kingdom – Tips, Tricks, Strategies,...
Qube Kingdom is a tower defense game from DeNA. You rally your troops – magicians, archers, knights, barbarians, and others – and fight against an evil menace looking to dominate your kingdom of tiny squares. Planning a war isn’t easy, so here are a... | Read more »
Qube Kingdom Review
Qube Kingdom Review By Nadia Oxford on August 29th, 2014 Our Rating: :: KIND OF A SQUARE KINGDOMUniversal App - Designed for iPhone and iPad Qube Kingdom has cute visuals, but it’s a pretty basic tower defense game at heart.   | Read more »
Fire in the Hole Review
Fire in the Hole Review By Rob Thomas on August 29th, 2014 Our Rating: :: WALK THE PLANKUniversal App - Designed for iPhone and iPad Seafoam’s Fire in the Hole looks like a bright, 8-bit throwback, but there’s not enough booty to... | Read more »
Alien Creeps TD is Now Available Worldwi...
Alien Creeps TD is Now Available Worldwide Posted by Ellis Spice on August 29th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Dodo Master Review
Dodo Master Review By Jordan Minor on August 29th, 2014 Our Rating: :: NEST EGGiPad Only App - Designed for the iPad Dodo Master is tough but fair, and that’s what makes it a joy to play.   | Read more »
Motorsport Manager Review
Motorsport Manager Review By Lee Hamlet on August 29th, 2014 Our Rating: :: MARVELOUS MANAGEMENTUniversal App - Designed for iPhone and iPad Despite its depth and sense of tactical freedom, Motorsport Manager is one of the most... | Read more »
Motorsport Manager – Beginner Tips, Tric...
The world of Motorsport management can be an unforgiving and merciless one, so to help with some of the stress that comes with running a successful race team, here are a few hints and tips to leave your opponents in the dust. | Read more »
CalPal Update Brings the App to 2.0, Add...
CalPal Update Brings the App to 2.0, Adds Lots of New Stuff Posted by Ellis Spice on August 29th, 2014 [ permalink ] | Read more »

Price Scanner via MacPrices.net

Apple now offering refurbished 21-inch 1.4GHz...
The Apple Store is now offering Apple Certified Refurbished 21″ 1.4GHz iMacs for $929 including free shipping plus Apple’s standard one-year warranty. Their price is $170 off the cost of new models,... Read more
Save $50 on the 2.5GHz Mac mini, on sale for...
B&H Photo has the 2.5GHz Mac mini on sale for $549.99 including free shipping. That’s $50 off MSRP, and B&H will also include a free copy of Parallels Desktop software. NY sales tax only. Read more
Save up to $300 on an iMac with Apple refurbi...
The Apple Store has Apple Certified Refurbished iMacs available for up to $300 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. These are the best prices on... Read more
The Rise of Phablets
Carlisle & Gallagher Consulting Group, a businesses and technology consulting firm focused solely on the financial services industry, has released an infographic depicting the convergence of... Read more
Bad Driver Database App Allows Good Drivers t...
Bad Driver Database 1.4 by Facile Group is a new iOS and Android app that lets users instantly input and see how many times a careless, reckless or just plain stupid driver has been added to the... Read more
Eddy – Cloud Music Player for iPhone/iPad Fre...
Ukraine based CapableBits announces the release of Eddy, its tiny, but smart and powerful cloud music player for iPhone and iPad that allows users to stream or download music directly from cloud... Read more
A&D Medical Launches Its WellnessConnecte...
For consumers and the healthcare providers and loved ones who care for them, A&D Medical, a leader in connected health and biometric measurement devices and services, has launched its... Read more
Anand Lal Shimpi Retires From AnandTech
Anand Lal Shimpi, whose AnandTech Website is famous for its meticulously detailed and thoroughgoing reviews and analysis, is packing it in. Lal Shimpi, who founded the tech site at age 14 in 1997,... Read more
2.5GHz Mac mini, Apple refurbished, in stock...
The Apple Store has Apple Certified Refurbished 2.5GHz Mac minis available for $509, $90 off MSRP. Apple’s one-year warranty is included, and shipping is free. Read more
13-inch 2.5GHz MacBook Pro on sale for $999,...
B&H Photo has the 13″ 2.5GHz MacBook Pro on sale for $999.99 including free shipping plus NY sales tax only. Their price is $100 off MSRP. Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.